Volume XLII-3/W3
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-3/W3, 107–111, 2017
https://doi.org/10.5194/isprs-archives-XLII-3-W3-107-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-3/W3, 107–111, 2017
https://doi.org/10.5194/isprs-archives-XLII-3-W3-107-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.

  19 Oct 2017

19 Oct 2017

UPSCALING OF SOLAR INDUCED CHLOROPHYLL FLUORESCENCE FROM LEAF TO CANOPY USING THE DART MODEL AND A REALISTIC 3D FOREST SCENE

W. Liu1,2,3, J. Atherton3, M. Mõttus4, A. MacArthur5, H. Teemu6, K. Maseyk7, I. Robinson8, E. Honkavaara6, and A. Porcar-Castell3 W. Liu et al.
  • 1LREIS, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, 100101, China
  • 2University of Chinese Academy of Sciences, Beijing 100049, China
  • 3Optics of Photosynthesis Laboratory, Department of Forest Sciences, University of Helsinki, P.O. Box 27, 00014 Helsinki, Finland
  • 4VTT Techical Research Centre of Finland, P.O. Box 1000, 02044 VTT, Finland
  • 5School of Geosciences, University of Edinburgh, Grant Institute, Edinburgh. EH9 3FF, UK
  • 6Finnish Geodetic Institute, Geodeetinrinne 2, P.O. Box 15, 02431 Masala, Finland
  • 7Department of Environment, Earth and Ecosystems, Faculty of Science, Open University, Milton Keynes, UK
  • 8Laser Spectroscopy Group, Rutherford Appleton Laboratory, UK

Keywords: Chlorophyll florescence, Upscaling, DART, 3D scene, Forest

Abstract. Solar induced chlorophyll a fluorescence (SIF) has been shown to be an excellent proxy of photosynthesis at multiple scales. However, the mechanical linkages between fluorescence and photosynthesis at the leaf level cannot be directly applied at canopy or field scales, as the larger scale SIF emission depends on canopy structure. This is especially true for the forest canopies characterized by high horizontal and vertical heterogeneity. While most of the current studies on SIF radiative transfer in plant canopies are based on the assumption of a homogeneous canopy, recently codes have been developed capable of simulation of fluorescence signal in explicit 3-D forest canopies. Here we present a canopy SIF upscaling method consisting of the integration of the 3-D radiative transfer model DART and a 3-D object model BLENDER. Our aim was to better understand the effect of boreal forest canopy structure on SIF for a spatially explicit forest canopy.